21630013123610 has 16 divisors (see below), whose sum is σ = 38934981035496. Its totient is φ = 8651792491008.

The previous prime is 21630013123591. The next prime is 21630013123613. The reversal of 21630013123610 is 1632131003612.

It can be written as a sum of positive squares in 4 ways, for example, as 7040844664681 + 14589168458929 = 2653459^2 + 3819577^2 .

It is not an unprimeable number, because it can be changed into a prime (21630013123613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26167487 + ... + 26981426.

Almost surely, 2^{21630013123610} is an apocalyptic number.

21630013123610 is a deficient number, since it is larger than the sum of its proper divisors (17304967911886).

21630013123610 is a wasteful number, since it uses less digits than its factorization.

21630013123610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53189617.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 21630013123610 in words is "twenty-one trillion, six hundred thirty billion, thirteen million, one hundred twenty-three thousand, six hundred ten".